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                <h1><span id="pc-h5项目踩坑">pc、h5项目踩坑</span></h1><h2><span id="html2canvas插件的使用分享海报绘制功能"><strong>html2canvas插件的使用—–分享海报绘制功能</strong></span></h2><p>安装依赖：</p>
<pre><code>npm install --save html2canvas</code></pre><p>html:</p>
<pre class=" language-html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>posters<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    dom画布内容
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span></code></pre>
<p>js</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token operator">&lt;</span>script<span class="token operator">></span>
<span class="token keyword">import</span> html2canvas <span class="token keyword">from</span> <span class="token string">'html2canvas'</span><span class="token punctuation">;</span>

data<span class="token punctuation">:</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      canvasImg<span class="token punctuation">:</span> <span class="token string">""</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>  
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>

methods<span class="token punctuation">:</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token function">loadingPosters</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>canvasImg<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                    <span class="token keyword">return</span>
                <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
                <span class="token comment" spellcheck="true">//解决截图不全问题</span>
                window<span class="token punctuation">.</span>pageYoffset <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
               document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>scrollTop <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
               document<span class="token punctuation">.</span>body<span class="token punctuation">.</span>scrollTop <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
               <span class="token comment" spellcheck="true">//截图方法调用</span>
               <span class="token function">html2canvas</span><span class="token punctuation">(</span>document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'posters'</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                        width<span class="token punctuation">:</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'posters'</span><span class="token punctuation">)</span><span class="token punctuation">.</span>offsetWidth<span class="token punctuation">,</span>   <span class="token comment" spellcheck="true">//获取dom的宽度</span>
                        height<span class="token punctuation">:</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'posters'</span><span class="token punctuation">)</span><span class="token punctuation">.</span>offsetHeight<span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">//获取dom的高度</span>
                        useCORS<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">//允许跨域，重点：需要后端配置图片url跨域!!!,否则拿接口的图片url会出现跨域问题导致无法显示</span>
                        logging<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">//启用日志以进行调试,查看html2canvas的内部执行流程</span>
                        scrollY<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>       <span class="token comment" spellcheck="true">//解决偏移问题</span>
                        scrollX<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span>      <span class="token comment" spellcheck="true">//解决偏移问题</span>
                        backgroundColor<span class="token punctuation">:</span> <span class="token keyword">null</span>     <span class="token comment" spellcheck="true">//背景颜色为null为透明（默认是白色，可能海报会留白边的情况）</span>
                    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span>
                    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>canvas <span class="token operator">=</span><span class="token operator">></span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                        <span class="token keyword">var</span> pageData <span class="token operator">=</span> canvas<span class="token punctuation">.</span><span class="token function">toDataURL</span><span class="token punctuation">(</span><span class="token string">'image/jpeg'</span><span class="token punctuation">,</span> <span class="token number">1.0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    <span class="token comment" spellcheck="true">//生成一个base64的图片</span>
                        <span class="token keyword">this</span><span class="token punctuation">.</span>canvasImg <span class="token operator">=</span> pageData    
                    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span>
            <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>script<span class="token operator">></span></code></pre>
<h2><span id="踩坑">踩坑：</span></h2><h3><span id="1截图不全问题">1.截图不全问题：</span></h3><p>如果出现截图不全的问题，可以试一下在调用html2canvas方法截图之前，将滚动条置顶</p>
<pre class=" language-javascript"><code class="language-javascript">window<span class="token punctuation">.</span>pageYoffset <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>                
document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>scrollTop <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>                
document<span class="token punctuation">.</span>body<span class="token punctuation">.</span>scrollTop <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span></code></pre>
<h3><span id="2配置属性以及属性对应属性解决的相关问题">2.配置属性以及属性对应属性解决的相关问题：</span></h3><pre class=" language-javascript"><code class="language-javascript"><span class="token function">html2canvas</span><span class="token punctuation">(</span>dom<span class="token punctuation">,</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>  
width<span class="token punctuation">:</span> dom<span class="token punctuation">.</span>offsetWidth<span class="token punctuation">,</span> <span class="token comment" spellcheck="true">//dom的宽度 </span>
height<span class="token punctuation">:</span>dom<span class="token punctuation">.</span>offsetHeight<span class="token punctuation">,</span> <span class="token comment" spellcheck="true">//dom的高度 </span>
useCORS<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">//允许跨域，重点：需要后端配置图片url允许跨域!!!,否则拿接口的图片url会出现跨域问题导致无法显示</span>
logging<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">//启用日志以进行调试,查看html2canvas的内部执行流程                         </span>
scrollY<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">//解决截图偏移问题   </span>
scrollX<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">//解决截图偏移问题 </span>
backgroundColor<span class="token punctuation">:</span> <span class="token keyword">null</span>     <span class="token comment" spellcheck="true">//背景颜色为null为透明（默认是白色，如果绘制出来留白边的情况，可以试一下配置一下这个）                 </span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>canvas <span class="token operator">=</span><span class="token operator">></span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>                         
<span class="token keyword">var</span> pageData <span class="token operator">=</span> canvas<span class="token punctuation">.</span><span class="token function">toDataURL</span><span class="token punctuation">(</span><span class="token string">'image/jpeg'</span><span class="token punctuation">,</span> <span class="token number">1.0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>        
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span></code></pre>
<h3><span id="3dom过长截图不全的问题">3.dom过长截图不全的问题</span></h3><p>在你的<strong>分享海报比较长的时候</strong>，就要注意了（比较短的就无需理会），<strong>试过海报长度有上1000px</strong>的将绘制的方法放在nextTick上执行也还是会出现截图不全的情况，需要将<strong>该绘制方法放在一个定时器中</strong>绘制，在下一个宏任务执行（<strong>可能是因为dom太长，还没渲染完毕就执行的绘制的方法，导致截图不全的情况</strong>）</p>
<p><strong>另一个解决方案是</strong>：先显示dom给用户看，当用户先下载图片的时候，才使用html2canvas生成图片</p>
<h3><span id="4文本省略">4.文本省略</span></h3><p><strong>html2canvas使用text-overflow：ellipsis实现文本省略是不生效的</strong>，如果需要实现省略功能只能通过js实现——通过计算限定文本不可超过的高度，然后通过js手动截取文字在末尾添加省略号（…）</p>
<p>解决方案：使用js解决</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// el 对应文本的dom对象</span>
<span class="token comment" spellcheck="true">//height 高度 =  文本的行高 * 需要显示的行数</span>
<span class="token function">overflowHiddon</span><span class="token punctuation">(</span>el<span class="token punctuation">,</span>height<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>     
  <span class="token keyword">var</span> s <span class="token operator">=</span> el<span class="token punctuation">.</span>textContent <span class="token operator">||</span> el<span class="token punctuation">.</span>innerText<span class="token punctuation">;</span>     
  <span class="token keyword">var</span> n <span class="token operator">=</span> el<span class="token punctuation">.</span>offsetHeight<span class="token punctuation">;</span>     
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> s<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>        
    el<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">substr</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> i<span class="token punctuation">)</span><span class="token punctuation">;</span>        
    <span class="token keyword">if</span> <span class="token punctuation">(</span>height <span class="token operator">&lt;</span> el<span class="token punctuation">.</span>scrollHeight<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>           
        el<span class="token punctuation">.</span>style<span class="token punctuation">.</span>overflow <span class="token operator">=</span> <span class="token string">'hidden'</span><span class="token punctuation">;</span>           
        el<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">substr</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> i <span class="token operator">-</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">'...'</span><span class="token punctuation">;</span>           
        <span class="token keyword">break</span><span class="token punctuation">;</span>       
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>                         
 <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>           
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span></code></pre>
<p>使用：</p>
<p>html:</p>
<pre class=" language-html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>posters-title<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>posters-title<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token entity" title="&#123;">&amp;#123;</span><span class="token entity" title="&#123;">&amp;#123;</span> postersData.title <span class="token entity" title="&#125;">&amp;#125;</span><span class="token entity" title="&#125;">&amp;#125;</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span></code></pre>
<p>js:</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">$nextTick</span><span class="token punctuation">(</span>_<span class="token operator">=</span><span class="token operator">></span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token keyword">var</span> text <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementsByClassName</span><span class="token punctuation">(</span><span class="token string">'posters-title'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> text<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">overflowHiddon</span><span class="token punctuation">(</span>text<span class="token punctuation">[</span>i<span class="token punctuation">]</span>，<span class="token number">40</span> <span class="token operator">*</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span>

<span class="token comment" spellcheck="true">//height为文字的行高</span>
<span class="token function">overflowHiddon</span><span class="token punctuation">(</span>el<span class="token punctuation">,</span>height<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token keyword">var</span> s <span class="token operator">=</span> el<span class="token punctuation">.</span>textContent <span class="token operator">||</span> el<span class="token punctuation">.</span>innerText<span class="token punctuation">;</span>
    <span class="token keyword">var</span> n <span class="token operator">=</span> el<span class="token punctuation">.</span>offsetHeight<span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> s<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
       el<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">substr</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> i<span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token keyword">if</span> <span class="token punctuation">(</span>height <span class="token operator">&lt;</span> el<span class="token punctuation">.</span>scrollHeight<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
          el<span class="token punctuation">.</span>style<span class="token punctuation">.</span>overflow <span class="token operator">=</span> <span class="token string">'hidden'</span><span class="token punctuation">;</span>
          el<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> s<span class="token punctuation">.</span><span class="token function">substr</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> i <span class="token operator">-</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">'...'</span><span class="token punctuation">;</span>
          <span class="token keyword">break</span><span class="token punctuation">;</span>
      <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>

   <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>          
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span></code></pre>
<h3><span id="5省略号边框的绘制">5.省略号边框的绘制</span></h3><p><img src="https://gitee.com/mo_zi_hao/picsBed/raw/master/image/image.png" alt="示例"></p>
<p><strong>html2canvas不兼容省略号的边框（生成的图片的省略号边框会是一条实线）：</strong></p>
<p>解决方案：使用在想要加省略号边框的元素使用伪元素，伪元素的content内容为●●●●(这个点是输入法的，在符号中找，不然键盘的那个点太小了使用font-size调大会出现行高很大，那个点很小的情况)，这个点输入尽可能多，给一下width：100%和overflow：hidden就好了，然后再设置一下字体间距css的letter-spacing，设置一下字体颜色，那就可以实现虚线的效果了。然后给一下行高和使用绝对定位和transform定位到你想要的位置即可</p>
<h3><span id="7截图模糊问题">7.截图模糊问题</span></h3><p><strong>html2canvas有一个scale属性</strong>，这个属性的默认值的是window.devicePixelRatio（设备像素比），下面是我去文档截的图</p>
<p><img src="https://gitee.com/mo_zi_hao/picsBed/raw/master/image/trzbvbiyaiaq.png" alt="devicePixelRatio"></p>
<p>如果你所要绘制的图片相对于浏览器是比较小的话，很可能生成的像素并不是很高，例如下面这张图</p>
<p><img src="https://gitee.com/mo_zi_hao/picsBed/raw/master/image/pmdvpcdgurtg.png" alt></p>
<p><img src="https://gitee.com/mo_zi_hao/picsBed/raw/master/image/image.png" alt="示例"></p>
<p>像这张图生成出来后，我发送到手机上看是相对比较模糊的，因为手机上点预览会是放大到手机屏幕的最大宽度，所以图片可能会被放大，那么这张图的像素不够的话显然是会出现模糊的情况的</p>
<p><strong>解决方案：</strong></p>
<p>所以我们在使用html2canvas截图的时候我们将scale这个属性设置为2，将他的像素放大两倍，那么就可以解决截图模糊的问题了（如果还是模糊可以试试再调大一点）</p>
<h3><span id="分享也当然少不了下载功能和复制链接功能了">分享也当然少不了下载功能和复制链接功能了</span></h3><p><strong>复制链接方法</strong></p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token function">copyLink</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
     <span class="token keyword">let</span> copyLink <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'copyLink'</span><span class="token punctuation">)</span>
     copyLink<span class="token punctuation">.</span>value <span class="token operator">=</span> window<span class="token punctuation">.</span>location<span class="token punctuation">.</span>href
     copyLink<span class="token punctuation">.</span><span class="token function">select</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
     <span class="token keyword">try</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
       document<span class="token punctuation">.</span><span class="token function">execCommand</span><span class="token punctuation">(</span><span class="token string">'copy'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"复制成功"</span><span class="token punctuation">)</span>
     <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">e</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"复制失败"</span><span class="token punctuation">)</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span></code></pre>
<p>移动端无法下载base64的图片需要转换类型再下载</p>
<p>base64转blob类型</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token function">base64ToBlob</span><span class="token punctuation">(</span>downLoad<span class="token punctuation">,</span> base64Img<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                <span class="token keyword">var</span> blob <span class="token operator">=</span> <span class="token function">getBlob</span><span class="token punctuation">(</span>base64Img<span class="token punctuation">)</span><span class="token punctuation">;</span>
                console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>blob<span class="token punctuation">)</span>
                downLoad<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">'href'</span><span class="token punctuation">,</span> URL<span class="token punctuation">.</span><span class="token function">createObjectURL</span><span class="token punctuation">(</span>blob<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

                <span class="token keyword">function</span> <span class="token function">getBlob</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">getContentType</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span><span class="token punctuation">)</span>
                    <span class="token keyword">return</span> <span class="token function">b64toBlob</span><span class="token punctuation">(</span><span class="token function">getData</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">getContentType</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>

                <span class="token keyword">function</span> <span class="token function">getContentType</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                    <span class="token keyword">return</span> <span class="token regex">/data:([^;]*);/i</span><span class="token punctuation">.</span><span class="token function">exec</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
                <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>

                <span class="token keyword">function</span> <span class="token function">getData</span><span class="token punctuation">(</span>base64<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                    <span class="token keyword">return</span> base64<span class="token punctuation">.</span><span class="token function">substr</span><span class="token punctuation">(</span>base64<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">"base64,"</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token number">7</span><span class="token punctuation">,</span> base64<span class="token punctuation">.</span>length<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>

                <span class="token keyword">function</span> <span class="token function">b64toBlob</span><span class="token punctuation">(</span>b64Data<span class="token punctuation">,</span> contentType<span class="token punctuation">,</span> sliceSize<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                    contentType <span class="token operator">=</span> contentType <span class="token operator">||</span> <span class="token string">''</span><span class="token punctuation">;</span>
                    sliceSize <span class="token operator">=</span> sliceSize <span class="token operator">||</span> <span class="token number">512</span><span class="token punctuation">;</span>

                    <span class="token keyword">var</span> byteCharacters <span class="token operator">=</span> <span class="token function">atob</span><span class="token punctuation">(</span>b64Data<span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token keyword">var</span> byteArrays <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

                    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> offset <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> offset <span class="token operator">&lt;</span> byteCharacters<span class="token punctuation">.</span>length<span class="token punctuation">;</span> offset <span class="token operator">+</span><span class="token operator">=</span> sliceSize<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                        <span class="token keyword">var</span> slice <span class="token operator">=</span> byteCharacters<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>offset<span class="token punctuation">,</span> offset <span class="token operator">+</span> sliceSize<span class="token punctuation">)</span><span class="token punctuation">;</span>

                        <span class="token keyword">var</span> byteNumbers <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Array</span><span class="token punctuation">(</span>slice<span class="token punctuation">.</span>length<span class="token punctuation">)</span><span class="token punctuation">;</span>
                        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> slice<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                            byteNumbers<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">=</span> slice<span class="token punctuation">.</span><span class="token function">charCodeAt</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
                        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>

                        <span class="token keyword">var</span> byteArray <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Uint8Array</span><span class="token punctuation">(</span>byteNumbers<span class="token punctuation">)</span><span class="token punctuation">;</span>

                        byteArrays<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>byteArray<span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>

                    <span class="token keyword">var</span> blob <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Blob</span><span class="token punctuation">(</span>byteArrays<span class="token punctuation">,</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                        type<span class="token punctuation">:</span> contentType
                    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token keyword">return</span> blob<span class="token punctuation">;</span>
                <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span></code></pre>
<p>但是下载<strong>blob类型</strong>手机系统浏览器下载出现兼容问题，有的手机下载后是无法打开的，所以这里需要<strong>后端上传接口返回一个下载链接，通过a标签的download属性进行下载</strong></p>
<h2><span id="文件-图片下载"><strong>文件、图片下载</strong></span></h2><h3><span id="1-下载使用接口返回流的形式下载"><strong>1. 下载使用接口返回流的形式下载</strong></span></h3><p><strong>问题原因：</strong>下载是通过请求接口，接口返回流的形式实现。接口报错，因此下载失败。</p>
<p><strong>解决方案：</strong>解决接口报错问题；使用a标签的download属性下载，但要注意href地址不能跨域，跨域download属性会失效，而文件地址是存放在cos的，因此要把文件放到项目服务器下或者是使用nginx配置转发规则指向cos地址</p>
<h3><span id="2-如果没有使用接口返回流的形式下载文件"><strong>2. 如果没有使用接口返回流的形式下载文件</strong></span></h3><p><strong>pc端</strong>：使用a标签的download属性下载没有问题，但下载的文件附件、图片需要返回的链接是下载的链接而不是预览链接</p>
<p><strong>h5端</strong>: 使用下载的方法有以下两种</p>
<p><strong>1. iframe实现下载（ios不支持iframe）</strong></p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">//在h5中ios不兼容iframe</span>
<span class="token keyword">function</span> <span class="token function">downloadFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token keyword">var</span> src <span class="token operator">=</span> file<span class="token punctuation">.</span>fileUrl<span class="token punctuation">;</span>
    <span class="token keyword">var</span> iframe <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'iframe'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    iframe<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display <span class="token operator">=</span> <span class="token string">'none'</span><span class="token punctuation">;</span>
    iframe<span class="token punctuation">.</span>src <span class="token operator">=</span> <span class="token string">"javascript: '&lt;script>location.href=\""</span> <span class="token operator">+</span> src <span class="token operator">+</span> <span class="token string">"\"&lt;\/script>'"</span><span class="token punctuation">;</span>
    document<span class="token punctuation">.</span><span class="token function">getElementsByTagName</span><span class="token punctuation">(</span><span class="token string">'body'</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>iframe<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span></code></pre>
<p><strong>2. a标签的download属性下载</strong></p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">//如果使用遍历，a标签只会弹出最后一个</span>
<span class="token keyword">function</span> <span class="token function">downloadFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token keyword">let</span> title <span class="token operator">=</span> file<span class="token punctuation">.</span>fileName <span class="token operator">+</span> <span class="token string">'.'</span> <span class="token operator">+</span> file<span class="token punctuation">.</span>fileType
    <span class="token keyword">var</span> linkDom <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'a'</span><span class="token punctuation">)</span>
    linkDom<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">'href'</span><span class="token punctuation">,</span> file<span class="token punctuation">.</span>fileUrl<span class="token punctuation">)</span>
    linkDom<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">'download'</span><span class="token punctuation">,</span> title<span class="token punctuation">)</span>
    document<span class="token punctuation">.</span>body<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>linkDom<span class="token punctuation">)</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      linkDom<span class="token punctuation">.</span><span class="token function">click</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      document<span class="token punctuation">.</span>body<span class="token punctuation">.</span><span class="token function">removeChild</span><span class="token punctuation">(</span>linkDom<span class="token punctuation">)</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span> <span class="token number">60</span><span class="token punctuation">)</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span></code></pre>
<h3><span id="批量下载"><strong>批量下载</strong></span></h3><p>其中有一个需求是实现批量下载，没有使用流的形式，这里只能是使用遍历模拟批量下载，但是由于手机浏览器在下载之前是需要点击确认后才能下载的，确认后会出现跳转到浏览器下载的页面，然后返回接着点击下一个下载的文件的弹窗</p>
<p><strong>！！！最后考虑到ios兼容性的问题，还是需要服务端返回一个压缩包下载比较好</strong></p>
<p><strong>模拟批量下载（交互不太好）：</strong></p>
<p>遍历iframe实现下载的方法是可以实现以上的需求，但是ios不兼容</p>
<p>遍历a标签的download属性，发现只能弹出最后一个a标签的下载弹出，并不能实现像上面的那种模拟遍历的下载</p>
<p><strong>当下载的文件是图片</strong></p>
<p>当下载的文件是图片的格式的时候，试过iframe的下载方式是不能用的，后来用的a标签的download属性下载</p>
<p><strong>！！！注意</strong>：图片的链接的安全证书要保证没有过期，如果过期了，那么手机浏览器下载图片会出现下载失败的情况（uc浏览器除外）</p>
<h3><span id="在h5中判断手机系统">在h5中判断手机系统</span></h3><pre class=" language-javascript"><code class="language-javascript">  <span class="token keyword">var</span> u <span class="token operator">=</span> navigator<span class="token punctuation">.</span>userAgent<span class="token punctuation">;</span>
  <span class="token keyword">var</span> isAndroid <span class="token operator">=</span> u<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">'Android'</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token operator">-</span><span class="token number">1</span> <span class="token operator">||</span> u<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">'Adr'</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">//android终端</span>
  <span class="token keyword">var</span> isiOS <span class="token operator">=</span> <span class="token operator">!</span><span class="token operator">!</span>u<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span><span class="token regex">/\(i[^;]+;( U;)? CPU.+Mac OS X/</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">//ios终端</span></code></pre>
<h2><span id="vue中使用qrcodejs2插件生成二维码">vue中使用qrcodejs2插件生成二维码</span></h2><p>安装qrcodejs2插件</p>
<pre class=" language-javascript"><code class="language-javascript">npm install qrcodejs2 <span class="token operator">--</span>save</code></pre>
<p>页面中引入</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">import</span> QRCode <span class="token keyword">from</span> <span class="token string">'qrcodejs2'</span></code></pre>
<p>在对应的Html页面中，添加html标签</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token operator">&lt;</span>div id<span class="token operator">=</span><span class="token string">"qrcode"</span> ref<span class="token operator">=</span><span class="token string">"qrcode"</span><span class="token operator">></span><span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">></span></code></pre>
<p>配置，在methods方法里配置</p>
<pre class=" language-javascript"><code class="language-javascript">qrcode <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token keyword">let</span> $qrcode <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'qrcode'</span><span class="token punctuation">)</span>
    <span class="token keyword">let</span> qrcode <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">QRCode</span><span class="token punctuation">(</span><span class="token string">'qrcode'</span><span class="token punctuation">,</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
        width<span class="token punctuation">:</span> $qrcode<span class="token punctuation">.</span>offsetWidth<span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 设置宽度，单位像素</span>
        height<span class="token punctuation">:</span> $qrcode<span class="token punctuation">.</span>offsetHeight<span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 设置高度，单位像素</span>
        text<span class="token punctuation">:</span> <span class="token string">'https://www.baidu.com'</span>   <span class="token comment" spellcheck="true">// 设置二维码内容或跳转地址</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span></code></pre>
<p>调用</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">$nextTick</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">qrcode</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span></code></pre>
<h2><span id="移动端适配方式">移动端适配方式</span></h2><p>使用插件amfe-flexible，font-size的根元素大小由设计稿决定，如果ui设计稿按照375的宽度为标准，那么font-size的根元素大小为37.5</p>
<p>由上面插件计算出屏幕适配的font-size的大小</p>
<p>通过postcss-pxtorem插件进行全局转换成rem进行移动端的适配</p>
<p>px单位的像素 /  根元素font-size = 适配的比例</p>
<p>适配的px = 适配比例 * 当前根元素的font-size</p>
<pre class=" language-javascript"><code class="language-javascript">npm install postcss<span class="token operator">-</span>pxtorem <span class="token operator">--</span>save<span class="token operator">-</span>dev
npm install amfe<span class="token operator">-</span>flexible <span class="token operator">--</span>save</code></pre>
<h3><span id="1在vue-的mainjs中引入amfe-flexible">1.在Vue 的main.js中引入amfe-flexible</span></h3><pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">import</span>  <span class="token string">'amfe-flexible'</span><span class="token punctuation">;</span></code></pre>
<h3><span id="2在postcssrcjs-中配置vue-cli30-的版本在postcssconfigjs中配置">2.在.postcssrc.js 中配置，vue-cli3.0 的版本在postcss.config.js中配置。</span></h3><pre class=" language-javascript"><code class="language-javascript">module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
  <span class="token string">"plugins"</span><span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token string">'autoprefixer'</span><span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      browsers<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'Android >= 4.0'</span><span class="token punctuation">,</span> <span class="token string">'iOS >= 7'</span><span class="token punctuation">]</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
    <span class="token string">'postcss-pxtorem'</span><span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      rootValue<span class="token punctuation">:</span> <span class="token number">37.5</span><span class="token punctuation">,</span>
      propList<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'*'</span><span class="token punctuation">]</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span></code></pre>
<p>//当前页面的根字体大小</p>
<pre class=" language-javascript"><code class="language-javascript">document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>clientWidth <span class="token operator">/</span> <span class="token number">10</span>    <span class="token comment" spellcheck="true">//当前页面的根字体大小</span></code></pre>
<h2><span id="手机浏览器调试-手机的浏览器会有一个console-按钮">手机浏览器调试—-手机的浏览器会有一个console 按钮</span></h2><pre class=" language-javascript"><code class="language-javascript"><span class="token operator">&lt;</span>script type<span class="token operator">=</span><span class="token string">"text/javascript"</span> src<span class="token operator">=</span><span class="token string">"https://cdn.bootcss.com/vConsole/3.3.0/vconsole.min.js"</span><span class="token operator">></span><span class="token operator">&lt;</span><span class="token operator">/</span>script<span class="token operator">></span>

<span class="token operator">&lt;</span>script<span class="token operator">></span>
    <span class="token comment" spellcheck="true">// 初始化</span>
    <span class="token keyword">var</span> vConsole <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">VConsole</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Hello world'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>script<span class="token operator">></span></code></pre>
<h2><span id="h5调用手机拨号发短信功能">h5调用手机拨号发短信功能</span></h2><pre class=" language-html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">></span></span>里面加上：<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>format-detection<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>telephone<span class="token punctuation">=</span>yes<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span>
需要拨打电话的地方：<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>tel:400-0000-688<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>400-0000-688<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span>
发短信：<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>sms:18688888888<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>发短信<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span></code></pre>

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